Era : Entropy

Since the dawn of time, spirits have existed with humans, living in either harmony or chaos within nature. They feed off the emotions and state of nature, growing stronger with every imbalance in the world. Some humans are marked by spirits, and they possess the mark on their body forever. It is believed to be a sign of a life full of misfortune. In return however, they have heightened senses towards spirits.

When unrest and hatred rise in the human world, the spirits burst out of the barrier to wreak havoc. Centuries of spirit bursts and activity has wrecked the geography of the world, splitting tiny islands further away and forming gigantic territories.

Sakura lives in Unius, a formidable empire where a threat of such a burst looms over the divided civilization. She and her childhood friend Yukika bonded over their mark from spirits, though happy to live their life free from them. But as the world of humans and spirits come closer to colliding, they join the Otherworld Defenders, a group dedicated to suppressing the spirits from taking over the world. While meeting new allies and learning more about the spirit world, they must come to terms with secrets, changes, and a fate greater than themselves.